1 files changed, 93 insertions, 0 deletions
diff --git a/node_modules/first-chunk-stream/index.js b/node_modules/first-chunk-stream/index.js
new file mode 100644
index 000000000..24815508a
--- /dev/null
+++ b/node_modules/first-chunk-stream/index.js
@@ -0,0 +1,93 @@
+'use strict';
+var util = require('util');
+var Transform = require('stream').Transform;
+
+function ctor(options, transform) {
+	util.inherits(FirstChunk, Transform);
+
+	if (typeof options === 'function') {
+		transform = options;
+		options = {};
+	}
+
+	if (typeof transform !== 'function') {
+		throw new Error('transform function required');
+	}
+
+	function FirstChunk(options2) {
+		if (!(this instanceof FirstChunk)) {
+			return new FirstChunk(options2);
+		}
+
+		Transform.call(this, options2);
+
+		this._firstChunk = true;
+		this._transformCalled = false;
+		this._minSize = options.minSize;
+	}
+
+	FirstChunk.prototype._transform = function (chunk, enc, cb) {
+		this._enc = enc;
+
+		if (this._firstChunk) {
+			this._firstChunk = false;
+
+			if (this._minSize == null) {
+				transform.call(this, chunk, enc, cb);
+				this._transformCalled = true;
+				return;
+			}
+
+			this._buffer = chunk;
+			cb();
+			return;
+		}
+
+		if (this._minSize == null) {
+			this.push(chunk);
+			cb();
+			return;
+		}
+
+		if (this._buffer.length < this._minSize) {
+			this._buffer = Buffer.concat([this._buffer, chunk]);
+			cb();
+			return;
+		}
+
+		if (this._buffer.length >= this._minSize) {
+			transform.call(this, this._buffer.slice(), enc, function () {
+				this.push(chunk);
+				cb();
+			}.bind(this));
+			this._transformCalled = true;
+			this._buffer = false;
+			return;
+		}
+
+		this.push(chunk);
+		cb();
+	};
+
+	FirstChunk.prototype._flush = function (cb) {
+		if (!this._buffer) {
+			cb();
+			return;
+		}
+
+		if (this._transformCalled) {
+			this.push(this._buffer);
+			cb();
+		} else {
+			transform.call(this, this._buffer.slice(), this._enc, cb);
+		}
+	};
+
+	return FirstChunk;
+}
+
+module.exports = function () {
+	return ctor.apply(ctor, arguments)();
+};
+
+module.exports.ctor = ctor;